Here are a few other contemporary examples:

The OED says that religion is: Belief in, reverence for, and desire to
please, a divine ruling power.  (Reynolds Price)

For example, if the numbers read aloud were: 1. 2. 3. and 4, the answers
would be 3, 5, and 7.  (Education Week)

Fragments followed by colons are also not uncommon:

To sum up: the classical words adopted sine the Renaissance have enriched the
English language very greatly . . . .   (Otto Jespersen)

Well-known fact: In neither K-12 nor college English are systematic SWE
grammar and usage much taught anymore.  (David Foster Wallace)

I do wonder for how long the rule has been dying.  The following is from
Strunk and White's Elements of Style:

". . . it is exciting to reread . . . of this noble theme.  It goes:
"Vigorous writing is concise . . . ."

Ed Schuster

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